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From: <naomi.chu@mediatek.com>
To: <linux-scsi@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-mediatek@lists.infradead.org>,
	Alim Akhtar <alim.akhtar@samsung.com>,
	Avri Altman <avri.altman@wdc.com>,
	Bart Van Assche <bvanassche@acm.org>,
	"James E.J. Bottomley" <jejb@linux.ibm.com>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	AngeloGioacchino Del Regno 
	<angelogioacchino.delregno@collabora.com>,
	Manivannan Sadhasivam <mani@kernel.org>,
	Asutosh Das <quic_asutoshd@quicinc.com>,
	Can Guo <quic_cang@quicinc.com>
Cc: <wsd_upstream@mediatek.com>, <peter.wang@mediatek.com>,
	<casper.li@mediatek.com>, <powen.kao@mediatek.com>,
	<alice.chao@mediatek.com>, <naomi.chu@mediatek.com>,
	<chun-hung.wu@mediatek.com>, <cc.chou@mediatek.com>,
	<eddie.huang@mediatek.com>
Subject: [PATCH v3 1/1] ufs: core: Expand MCQ queue slot to DeviceQueueDepth + 1
Date: Thu, 2 Nov 2023 13:24:24 +0800	[thread overview]
Message-ID: <20231102052426.12006-2-naomi.chu@mediatek.com> (raw)
In-Reply-To: <20231102052426.12006-1-naomi.chu@mediatek.com>

From: Naomi Chu <naomi.chu@mediatek.com>

The UFSHCI 4.0 specification mandates that there should always be at
least one empty slot in each queue for distinguishing between full and
empty states. Enlarge the `hwq->max_entries` to `DeviceQueueDepth +1`
to allow UFSHCI 4.0 controllers to fully utilize MCQ queue slots.

Fixes: 4682abfae2eb ("scsi: ufs: core: mcq: Allocate memory for MCQ mode")
Signed-off-by: Naomi Chu <naomi.chu@mediatek.com>
---
 drivers/ufs/core/ufs-mcq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
index 2ba8ec254dce..5c75ab9d6bb5 100644
--- a/drivers/ufs/core/ufs-mcq.c
+++ b/drivers/ufs/core/ufs-mcq.c
@@ -436,7 +436,7 @@ int ufshcd_mcq_init(struct ufs_hba *hba)
 
 	for (i = 0; i < hba->nr_hw_queues; i++) {
 		hwq = &hba->uhq[i];
-		hwq->max_entries = hba->nutrs;
+		hwq->max_entries = hba->nutrs + 1;
 		spin_lock_init(&hwq->sq_lock);
 		spin_lock_init(&hwq->cq_lock);
 		mutex_init(&hwq->sq_mutex);
-- 
2.18.0


WARNING: multiple messages have this Message-ID (diff)
From: <naomi.chu@mediatek.com>
To: <linux-scsi@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-mediatek@lists.infradead.org>,
	Alim Akhtar <alim.akhtar@samsung.com>,
	Avri Altman <avri.altman@wdc.com>,
	Bart Van Assche <bvanassche@acm.org>,
	"James E.J. Bottomley" <jejb@linux.ibm.com>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	AngeloGioacchino Del Regno
	<angelogioacchino.delregno@collabora.com>,
	Manivannan Sadhasivam <mani@kernel.org>,
	Asutosh Das <quic_asutoshd@quicinc.com>,
	Can Guo <quic_cang@quicinc.com>
Cc: <wsd_upstream@mediatek.com>, <peter.wang@mediatek.com>,
	<casper.li@mediatek.com>, <powen.kao@mediatek.com>,
	<alice.chao@mediatek.com>, <naomi.chu@mediatek.com>,
	<chun-hung.wu@mediatek.com>, <cc.chou@mediatek.com>,
	<eddie.huang@mediatek.com>
Subject: [PATCH v3 1/1] ufs: core: Expand MCQ queue slot to DeviceQueueDepth + 1
Date: Thu, 2 Nov 2023 13:24:24 +0800	[thread overview]
Message-ID: <20231102052426.12006-2-naomi.chu@mediatek.com> (raw)
In-Reply-To: <20231102052426.12006-1-naomi.chu@mediatek.com>

From: Naomi Chu <naomi.chu@mediatek.com>

The UFSHCI 4.0 specification mandates that there should always be at
least one empty slot in each queue for distinguishing between full and
empty states. Enlarge the `hwq->max_entries` to `DeviceQueueDepth +1`
to allow UFSHCI 4.0 controllers to fully utilize MCQ queue slots.

Fixes: 4682abfae2eb ("scsi: ufs: core: mcq: Allocate memory for MCQ mode")
Signed-off-by: Naomi Chu <naomi.chu@mediatek.com>
---
 drivers/ufs/core/ufs-mcq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
index 2ba8ec254dce..5c75ab9d6bb5 100644
--- a/drivers/ufs/core/ufs-mcq.c
+++ b/drivers/ufs/core/ufs-mcq.c
@@ -436,7 +436,7 @@ int ufshcd_mcq_init(struct ufs_hba *hba)
 
 	for (i = 0; i < hba->nr_hw_queues; i++) {
 		hwq = &hba->uhq[i];
-		hwq->max_entries = hba->nutrs;
+		hwq->max_entries = hba->nutrs + 1;
 		spin_lock_init(&hwq->sq_lock);
 		spin_lock_init(&hwq->cq_lock);
 		mutex_init(&hwq->sq_mutex);
-- 
2.18.0


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2023-11-02  5:26 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-11-02  5:24 [PATCH v3 0/1] ufs: core: Expand MCQ queue slot to DeviceQueueDepth + 1 naomi.chu
2023-11-02  5:24 ` naomi.chu
2023-11-02  5:24 ` naomi.chu [this message]
2023-11-02  5:24   ` [PATCH v3 1/1] " naomi.chu
2023-11-02 13:23   ` Stanley Chu
2023-11-02 13:23     ` Stanley Chu
2023-11-02 16:37   ` Manivannan Sadhasivam
2023-11-02 16:37     ` Manivannan Sadhasivam
2023-11-02 19:15     ` Bart Van Assche
2023-11-02 19:15       ` Bart Van Assche
2023-11-02 19:16   ` Bart Van Assche
2023-11-02 19:16     ` Bart Van Assche
2023-11-03  2:19   ` Peter Wang (王信友)
2023-11-03  2:19     ` Peter Wang (王信友)
2023-11-03  2:35   ` Chun-Hung Wu (巫駿宏)
2023-11-03  2:35     ` Chun-Hung Wu (巫駿宏)
2023-11-09  2:35   ` Martin K. Petersen
2023-11-09  2:35     ` Martin K. Petersen
2023-11-15 15:13 ` [PATCH v3 0/1] " Martin K. Petersen
2023-11-15 15:13   ` Martin K. Petersen

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